differentiate between refractive Ray and Critical Angle. hi, Can you please help me out. I am stuck in this question. ​

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2